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I don't recommend losing weight the way I did to anyone, it wasn't intentional and I definitely suffered more than someone has to in order to lose weight, but it did work.

For reasons unrelated to my weight, I was stuck in a tiny mountain town where I had very little food and had to hike 3 miles down a mountain every day for water and food, and would obviously have to hike back up the three miles, while carrying food and water. I also had to chop wood the first 3 or 4 months I was there, because winter was coming.

That was my life for about 5-6 months, when I came back, I was 70lbs lighter, and my cardiovascular was and has never been better than right when I came back. After the year or two I was back, I did slowly start to gain weight again, but keeping weight off is WAY easier than losing it, so I've just been conscious about not gaining it back by working out and eating less food when I notice I'm getting a little squishy.